In his first-ever interview, the sole Australian survivor of the Waco siege has revealed to 60 Minutes what really took place during the 51-day stand-off, and why he believes crazed cult leader David Koresh will one day return to Earth as the son of God.

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"The daughter is getting significantly less than she sought," he told ABC Radio on July 15.

"On a matter of principle, if you're going to penalise children because of what their parents did ... it does set a pretty damaging precedent for the future."

Dhakota was aged nine at the time of her father's death.

Williams was a leading figure in Melbourne's bloody underworld war, in which more than 30 people died between 1998 and 2010.

He was jailed for life with a minimum of 38 years for the murders of gangland rivals Lewis Moran and his son Jason, Mark Mallia and Michael Marshall.

When word spread he was assisting police with information on crimes, including the murder of police informer Terence Hodson and his wife Christine in 2004, he became a marked man.

Despite CCTV surveillance of the cell, it took 27 minutes before anyone realised he had been bashed and lay fatally injured.

Johnson was convicted of Williams' murder in 2011. A Victorian Ombudsman's investigation found the murder, motivated by Williams' turning into a police informer, was a failure in the prison's duty of care to ensure his safety.